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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1817ca00bd6715a8d8cb60a9353f35b249b05fe21c926818096d35b4dca47208' 
  AND token = 'cYQ2b669mx2J/2ziv8MGgl5qsosfQ1jduipNx576PHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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