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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9ecd82b5f279e8636b0b77e7aa41c0f160752efbde6f67f48fe70e3d73509d' 
  AND token = 'Q0aaUBnEMHo9cB3Hk1rqTQ1lhZKTaJaUK1ESAmEI7n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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