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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7ca45a9de17d0024cf65817446b1a2b1cf2d7d86e877d46328b172e6d75e9a' 
  AND token = 'Wjae+PsuDxyV3JJ2ZOlg9+8ygHC0SLWkTzHzsgHDsAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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