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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe532dc2ef352fb5a45fa82d0148be4636b9be5cad428379a1c826d51846fc2' 
  AND token = 'CQYFia2zi8ondyRAIbZKRQzoH1b2i1oqTzP/CGvry1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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