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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb2636cdc8250579d3ad0ed0dc4981812eba9876030f333a317002db4643125' 
  AND token = 'vWBaKxngVtuIz4Dq0ZOhRi+hdAt3m40Z6aI1hq9Ak3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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