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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34a39bef534db2c3e7f6a9ae86562648d27de02e361838f015e5e42bb4863e1' 
  AND token = 'DgrEJ63BO8KzPIugYktZpDf6QSVdf3J5e2SqGEqiTZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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