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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1680b7f1357cca553ca90aa984752a28e6bbc6db6022822015f5ee4b46bd66c1' 
  AND token = 'ic1fFgl3f49WV5AzufmHQ25GL9tHHdYquMZr9JPqxU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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