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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93749d0a2f3f65f975485b5e6fe47bab3df1ef0719cf91dde5ab2cc012b13b7' 
  AND token = 'tMlP68FzNWMC9B+pSaTZ5zQloL8fmnrXK/z1MrAW6ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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