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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13871a7aadd7459a7de385fc3fad67742fb5d3d719f43047c1d226428ecb5bb' 
  AND token = 'ZLPpaBDISJbp4pLz8pWhKVkR11bhETOJq75/eO9CCL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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