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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc46b322fb0272a354ffa85c1f8414e3e8a80c7403d4039219e29948d7d79b7' 
  AND token = 'B1/AkdeZSkrr7SHlNlYroFtNMHwb/wzyBJi/xtjrAZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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