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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba18350f8a932e3dd413650c637fe8295180ee7a17f81f80a0535090fb213d8c' 
  AND token = 'NARMMUvSdyXSr0sEVypN1IJ3tpWFrEi56CsubXE4uRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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