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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec64a617ba80c2e8d4d3f6894ada31bff94e4c72a0c112e909202e1c099dc656' 
  AND token = '0VXbVkUORORQbcaYfxbXuJw6F1o7gb9fih63jZn4iRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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