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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bafb0bce16b05ad628acef9d9eff6f55ab6a5c0ba5aa6398de1c215c7550b5' 
  AND token = 'ZsTXO7tlYGeIZ1Zcb1wbxNiSQPCiw6Zpp28I5njcsFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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