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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803e28f6f3d25c7828fe66773d37b930ccf2d5433d586e4661efea42fe86a05e' 
  AND token = 'KZ3bZQcusbSYiTajvyEMpfTcYa7LHDuy1gXnMN2ZkXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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