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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e656d1af1493bfe48e7068f97c49c7107969b3835b8ded90999249e74734b971' 
  AND token = 'UBRzXyi5SkQB7A4VrQT/N4eK+leG8b9EZIL2bdEWnR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}