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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0f0c54db5155a2cfc3608471c4e565239f8a136175356d3d56ad4c5dec8094' 
  AND token = '32zuCD38ZXRXJ1IfG11cLBVUmp4vD7iYEZPXaRMf2zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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