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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c1ca501ce9c7277af697d89c1eb40a606c6bcb06696ddbcec6d7a162d2925c' 
  AND token = '3mCObAWnNOewOBv5lZp0VW+s/sJOFeuB767sGOO4djQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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