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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bfe1d9d1403dd87a3368a191a5daa42eebbbba2127dafcacc140d47287b1dd' 
  AND token = '/JCyY0YUl3/mRKa+9OHao2ixBPSTqY0VQAx32N5loD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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