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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf541be6ef67ca4e47df03dd4292589fabfff50f1bf39f20360a6d3ddc9a273' 
  AND token = 'S+QAw1Wm9CmDns5bhASgNNN+7LY97EBlOwAzL+IXwFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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