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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be92c9b7027993c08faa812c99a772bfef670ff82b2b5237cf2cc5fbdace731' 
  AND token = 'Is89CTKYJMBMAA/gxvFkV7+Q81l3N2Oqf35IKby97ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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