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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502acd75da6292bb0c5af57911ccf4ec9dbcdda91a044d93151dd27fc19b49e0' 
  AND token = '/4CbvYDy6J9RFwdR1shecIG1KnUrNlfDCGdNUEd/DNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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