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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0e3fa8f81f42b6407db13371a91e46d768b0dc0c6650b160fc14b153d42983' 
  AND token = 'Ar1DUshnmo7YF9mjUeQfAxE89r9CT3NmT8jbSDm3iZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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