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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2ee9102fd2a790505eea344784c1ff15979c3d56b1d295dd490e213fd50431' 
  AND token = '1uUOJEKS18iDabbZXeo+joiy1wMbHctW0W8VRtYoSP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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