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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dbb5890c0d3946f89ab2e09197d8b5a44551f614a1743b98c433c6eae48a06' 
  AND token = 'kekgv3hvXpk5XPHMQDwo3EXHHvWvjQIk5siiUHGhUpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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