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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50bbbd583a9af449755511ca1ee9f53c3005918ce036575a60eae9de43ec217' 
  AND token = '/uLTAmSza3NdMJtPULxpnYM8zdmNNaO/Bk/P5ETBrX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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