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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f704505cd05f851ed90c3acffb1aff32710a0f8c74a8e482e5166c71bd5c80c' 
  AND token = '4YnwpXp5/Leqc1utTBD7SyYtcZk77jX2hbwYI3Y0rwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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