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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52158fa1b50537a4013729bd4e06c7618c1952cc11f149ba768bd26f589f8af2' 
  AND token = 'q0Fnw0wDuD6gS+9YIPRqFyrfYObHY557m8U/iflbcfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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