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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93c56dda2f7e61a2650ec06d53034a7c45451f173c42d63e2051736bc635689' 
  AND token = 'tEIN5VXReZt05sIlwd1f7D2d2323Ha5Yorvbvv7XSyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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