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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496c0c9103f262767046335288929772ae805dd5aed1e8a9798c60be8907db3b' 
  AND token = 'r3slAAiEIzazbHcZlLR1W91urNNKmcbMlLe+QOpRZII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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