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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7013d5aed31c570e487ec58f2fb8b5e8620e3ee7faf22d2140f0342bff1d9490' 
  AND token = 'wVzfs2/8m2yEEmClF6OGzqtiV4w6NXphNEquhnnNuUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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