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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c939b68a82ef88bac18202013d4f82441ab073090675175275fb7021e09aee' 
  AND token = 'aZLYfdF3w0DmR9I9J+8x0WpzeZAgsAV7y8v5chRStjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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