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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad36ad60b9c11c17526ca6d51a839c8577d99ca6b0bcf7d81a2a0823605e29cb' 
  AND token = 'D9lXlRhNSOm6xavUcQTSdHMebE3teUJ8FJu2x5C8Kmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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