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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030177be3c243e8b1a990c5ef867d0608f6a85e6313eac5472fc5a042653258c' 
  AND token = 'DR/4DEvPV4UUir8hKN6fJWRoa6ayL/zOyxvvTIKcYfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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