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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd941bcd545978d8777ecf132e143db7e83a6c97564a98f4ade0a6c8a7b929aaa' 
  AND token = '+3YTUHZIA3Puak1f+lddSg+Mda8jTpyTjrHApIuCCpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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