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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8793de5c7497b2bfe921bda23398aceebafec18d70642998e0a06b851ed0b3d' 
  AND token = 'CnXiqrMZAO/v/u5HI3yP7JUthCgKjn5fjb5YPxRetHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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