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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2540e2f797685caaf5ecb95302506e23849ccacfd361f5b0294ea7490bf17d80' 
  AND token = 'dX9JeSau2+3iuKB7RXnmxCVO6bNqnpetM8LyGP5h1FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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