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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0693ccd99fa56c11f809b07aa0d7895166a686c29a9d7e79fc1c0ea22ac90b17' 
  AND token = '5ScPtXSF+5HYJWCJEfYyehNmaCSgC3fo96TzIlErU20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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