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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6ce6603bc005de0d5ecb4e4a2a9d57f3648960851401de167e7378a5713a14' 
  AND token = 'bpZuwylUajQe0Ghs+7faMPkzC8QKNLxzxUmm4WEn/pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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