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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbae2a134d84c25a29e0263c5333cfa1df36fc66793c3bd9ec49aa9e161375e1' 
  AND token = 'V/lQ0/pEQ6cOrfHLQJcbsgipkYoOxJM72GgtKUFrrxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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