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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8ad35264bdfa2c27c25847edbb16a80adbb4a13dc09b2ce5426b499deff7ea' 
  AND token = 'z42jEuHHSsV9d5kXJMfEQNBPSwO9iXnlalRiAEjHmPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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