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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069dd267b2688aac0563f86c82ef64d0aedf8f3e6f4eee781cc3dae236f75e3e' 
  AND token = 'vhpQJucOXVf1H/1eyM4GeqqwvtsUSCtmA9VN+IDtZjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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