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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6dd40d29e675daa7f90b0d15b1d38456bd24ae56d389fa3fc271a3d9c121ea' 
  AND token = 'DR/TtiLd0NcK0/thxPcg/K6jBCXagSjb4B1eDDYxBBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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