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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07657807837746f2bf101c0a5299813683d079c1504617d5a3586ba4b8ba4bd8' 
  AND token = 'fwUxvyNasssKhF+i5gbQNuw05obqqBNu+JTClW66PDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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