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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0938d5a335acb8dff1395720d05ba5e7da8f184ec185d2314e38597c501f3d9' 
  AND token = '/p3PcXm7eIziPlv8AzMiqujucErpwA9qqCYTaj2G1ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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