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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535dab47393a7c59d5902d8e442730c8279d0d1e66bbd5b914a7dfd3732cc730' 
  AND token = 'lfvtTsONoVIo82SeTnPwa4CuYC3ywK0n2AIy15QXbpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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