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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae13576c2c228097a4a393e7ab90320cd408fd54931adcbf2f8241e99628ae2b' 
  AND token = 'sLCiCojcyv4XE0y1qZFX5ZPlMVRU9U5rQTzQkA0l+t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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