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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685dafeeadf3e72eee7827867dc1c212b877e6f8132f4e9ae5b68e08b53b8464' 
  AND token = 'OjgNjk1NoH1v5UCXPBRpNljy/5EUlSjhw1UQW+invUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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