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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad42e0b38263d24c3fdb75177f6dbcb1ca66b4a23c687996204d8211fd8cab50' 
  AND token = 'aQkigROnhK+8785MIxXN2P6k4GZo7ri1eT05Mgr5qbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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