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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0de97df9c53a67eb40f9690d9aa9337533bb812e4675464adba9c38bb6c8b32' 
  AND token = 'QDyAYnMKMPsp0CIjiEF9B9TmTHScAYsD5uT0GA+bePA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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