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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d2ef82013183056691644225b037a6cbf5754c0c144ab0a7dca35a304926d3' 
  AND token = 'XQm1BpR1wgkNvlH7Hpt4MZNY/HeDQ8k3U3y5RSFpswk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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