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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e20decd015a4781a3214ade642ad7a7631ebf65d21d72a01cf42a92064d42eb' 
  AND token = 'OYgcR/Tp/gZg97n/W45gyyjW6HdtVWt1TxstcPduwZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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