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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e103e84f4f8eb8ace92ea18fa84c17e9c2670fd8b4b4eaa1977ecb3890b6a8' 
  AND token = 'H7FLNn2opIuctn8xiTPBZEKcMkSBPdI0pvqNwHA7EfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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