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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4078acde0f711a2f791b805ba6c372882a4f13df5b7646ba93f5799c271d720' 
  AND token = 'ob2rzFM2Xiy01nM0z/oFUVbeYfZZOfLzSKdzt+PeG20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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