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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96524e175e2e38e990613d6381047e04408158e50f750ee8915ec63734a8415' 
  AND token = '2YCOs68flGXShAerpM5uNLDa/JmZp/lj9j/c0Wm8FOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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