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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7d5e5dedd4789d101c044a57c94868ca8a008b93407f8929fc41edfaadbc15' 
  AND token = 'CnZzPhTTaZXKXdP6HPIyMdujm+3aGN7C38ihUhpg6rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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