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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba66a606a3403e0a776988c19cebd4cbb1042568d7111bfa8addc169f0864bb' 
  AND token = 'he2AM4+Ha9d1hpcM0+xC49bzJy0LwVHT6N3Y+UIDitg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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