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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c8daea0807100dc88965c2be3fcb6c0a951af770d998a77569e77e9a2c1f66' 
  AND token = 'aIeD8HOPeAPcbg/+w5EiXp3AjO/EQjWd6JISRtaYzq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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