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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0aa1e75ab5acb483c7043e80b8e6171716669b98b2a8f0982efb31c5568d63b' 
  AND token = 'C8ezteSL1OysP0cSZH7gVOo0y44JWmLagS83Ffh2giQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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