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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8198074adf2f1958f695048c355c707eed4afdbc6d3433dd4644a7e38663be38' 
  AND token = '6ReZ/TN437diO8bIqWdiCesfbF6+Q7mnP3aVXigUtyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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