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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e975b6c96bed2ce0f898c2b4d8fec474d7906a7014e6c88eee1f4e60f0376b79' 
  AND token = 'cyPs8aT862wV4Ab/D52SFdShnPtmZkQjkgp3NjGMUPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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