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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dd8d3d96b566db2bc24ae0d8d2a4a899e934ef6927a6fd928592edad0acff9' 
  AND token = '52pxpdXdb5ZbHcjrTxm7OfEXSgKuLsr3+Z7E99Y46j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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